We need to talk about Kenny

The champions' poor form has led to questions about the quality of the squad at Moyes' disposal, and the Scot has hinted at his concerns.

"I think a lot of them are giving their best, but if that is not enough, it is something I need to have a look at," Moyes said in The Times.

Moyes is currently without key strikers Wayne Rooney and Robin van Persie, the former struggling with a groin problem and the latter a thigh injury.

Rooney has been sent for warm-weather training in a bid to aid his fitness ahead of a crunch meeting with Chelsea on January 19, but it remains to be seen when Van Persie will return.

"We are hoping Wayne will be fit for [Chelsea]," Moyes said. "We just want to nip [the injury] in the bud and see if we can get on top of it.

"We are trying to get Robin back but it's a thigh strain similar to the one he had at Arsenal so we are having to manage it correctly. There are some injuries you can play with, but I actually don't think you can do that with Robin's injury."